2TB external hard disk is good enough for load lots of data. But if data need long time to transfer then all good thing convart to bad thing. Lenovo F309 hard disk is like slow motion train. It takes 20 minuts to load only 15 Gb. And if I want to load 1Tb it takes 15 hours. This is not right for me. Because I always use external hard disk to carry most important data for office work. And if I waste 8 to 10 hour for loading data to this hard disk, then I will be suspended from my job. For this I dislike this product.